Driver chip, display panel, and driving method thereof

Abstract

A driver chip, a display panel, and a driving method thereof are provided. The driver chip uses a pulse width modulation module and a pulse amplitude modulation module to control a waveform and a strength of a data signal respectively, which can obtain more display grayscales, a to-be-displayed brightness of a light emitting unit is larger, and a gradation level of the light-emitting unit is better. The pulse amplitude modulation module can modulate the strength of the data signal, can compensate the pixels, and improve the display quality of the display panel.

What is claimed is: 
     
         1 . A driver chip, comprising:
 a data signal input module connected to a transistor of a pixel for inputting a data signal into the transistor;   a pulse width modulation module connected to the data signal input module for outputting a waveform corresponding to the data signal to the data signal input module according to a to-be-displayed brightness of the pixel; and   a pulse amplitude modulation module connected to the data signal input module for outputting a strength corresponding to the data signal to the data signal input module according to a to-be-displayed brightness of the pixel;   wherein the data signal input module is configured to process the waveform corresponding to the data signal and the strength corresponding to the data signal to obtain the data signal after receiving the waveform corresponding to the data signal and the strength corresponding to the data signal.   
     
     
         2 . The driver chip according to  claim 1 , wherein a number of bits of the pulse width modulation module is equal to or greater than a number of bits of the pulse amplitude modulation module. 
     
     
         3 . The driver chip according to  claim 2 , wherein the number of bits of the pulse width modulation module is 7, and the number of bits of the pulse amplitude modulation module is 5. 
     
     
         4 . The driver chip according to  claim 2 , wherein the driver chip further comprises a grayscale module, the grayscale module is configured to determine a maximum display grayscale of the pixel according to the bits of the pulse width modulation module and the bits of the pulse amplitude modulation module and determine the waveform corresponding to the data signal outputted from the pulse width modulation module and the strength corresponding to the data signal outputted from the pulse amplitude modulation module at each display grayscale according to the maximum display grayscale of the pixel. 
     
     
         5 . The driver chip according to  claim 4 , wherein the driver chip further comprises a signal acquisition module, the signal acquisition module is configured to determine a to-be-displayed grayscale of the pixel according to the to-be-displayed brightness of the pixel and send an acquisition signal to the grayscale module according to the to-be-displayed grayscale, and the grayscale module is configured to return the waveform corresponding to the data signal outputted from the pulse width modulation module and the strength corresponding to the data signal outputted from the pulse amplitude modulation module to the signal acquisition module after receiving the acquisition signal. 
     
     
         6 . The driver chip according to  claim 1 , wherein a number of bits of the pulse amplitude modulation module is greater than a number of bits of the pulse width modulation module. 
     
     
         7 . The driver chip according to  claim 6 , wherein the number of bits of the pulse amplitude modulation module is 8, and the number of bits of the pulse width modulation module is 7. 
     
     
         8 . The driver chip according to  claim 1 , wherein the driver chip further comprises a parasitic capacitance, the pulse amplitude modulation module is configured to output the strength corresponding to a compensation data signal when the pixel is not displayed according to a value of the parasitic capacitance, and the pulse width modulation module is configured to output the waveform corresponding to the compensation data signal when the pixel is not displayed according to the value of the parasitic capacitance. 
     
     
         9 . A display panel including a driver chip and pixels arranged in an array, wherein the driver chip comprises:
 a data signal input module connected to a transistor of one of the pixel for inputting a data signal into the transistor;   a pulse width modulation module connected to the data signal input module for outputting a waveform corresponding to the data signal to the data signal input module according to a to-be-displayed brightness of the pixel; and   a pulse amplitude modulation module connected to the data signal input module for outputting a strength corresponding to the data signal to the data signal input module according to a to-be-displayed brightness of the pixel;   wherein the data signal input module is configured to process the waveform corresponding to the data signal and the strength corresponding to the data signal to obtain the data signal after receiving the waveform corresponding to the data signal and the strength corresponding to the data signal.   
     
     
         10 . The display panel according to  claim 9 , wherein a number of bits of the pulse width modulation module is equal to or greater than a number of bits of the pulse amplitude modulation module. 
     
     
         11 . The display panel according to  claim 10 , wherein the number of bits of the pulse width modulation module is 7, and the number of bits of the pulse amplitude modulation module is 5. 
     
     
         12 . The display panel according to  claim 10 , wherein the driver chip further comprises a grayscale module, the grayscale module is configured to determine a maximum display grayscale of the pixel according to the bits of the pulse width modulation module and the bits of the pulse amplitude modulation module and determine the waveform corresponding to the data signal outputted from the pulse width modulation module and the strength corresponding to the data signal outputted from the pulse amplitude modulation module at each display grayscale according to the maximum display grayscale of the pixel. 
     
     
         13 . The display panel according to  claim 12 , wherein the driver chip further comprises a signal acquisition module, the signal acquisition module is configured to determine a to-be-displayed grayscale of the pixel according to the to-be-displayed brightness of the pixel and send an acquisition signal to the grayscale module according to the to-be-displayed grayscale, and the grayscale module is configured to return the waveform corresponding to the data signal outputted from the pulse width modulation module and the strength corresponding to the data signal outputted from the pulse amplitude modulation module to the signal acquisition module after receiving the acquisition signal. 
     
     
         14 . The display panel according to  claim 9 , wherein a number of bits of the pulse amplitude modulation module is greater than a number of bits of the pulse width modulation module. 
     
     
         15 . The display panel according to  claim 9 , wherein the driver chip further comprises a parasitic capacitance, the pulse amplitude modulation module is configured to output the strength corresponding to a compensation data signal when the pixel is not displayed according to a value of the parasitic capacitance, and the pulse width modulation module is configured to output the waveform corresponding to the compensation data signal when the pixel is not displayed according to the value of the parasitic capacitance. 
     
     
         16 . The display panel according to  claim 9 , wherein the display panel includes a power terminal, a light emitting unit, a driving transistor, and a switching transistor, the driver chip includes a scanning signal input module, the power terminal is electrically connected to an anode of the light emitting unit, a cathode of the light emitting unit is electrically connected to a first electrode of the driving transistor, a second electrode of the driving transistor is electrically connected to the ground, a gate of the driving transistor is electrically connected to a second electrode of the switching transistor, a first electrode of the switching transistor is electrically connected to the data signal input module, and a gate of the switching transistor is electrically connected to the scanning signal input module. 
     
     
         17 . A driving method of display panel, comprising steps of:
 acquiring a to-be-displayed image of a display panel;   determining a to-be-displayed brightness of each pixel according to the to-be-displayed image of the display panel;   determining a display grayscale corresponding to the to-be-displayed brightness of each pixel according to the to-be-displayed brightness of each pixel;   determining a data signal corresponding to the display grayscale according to the display grayscale corresponding to the to-be-displayed brightness of each pixel;   determining a waveform and a strength corresponding to the data signal according to the data signal corresponding to the display grayscale; and   actuating a pulse width modulation module and a pulse amplitude modulation module of the driver chip to output the waveform corresponding to the data signal and the strength corresponding to the data signal respectively for displaying the to-be-displayed image.   
     
     
         18 . The driving method of display panel according to  claim 17 , wherein before the step of acquiring the to-be-displayed image of the display panel, the driving method further comprises steps of:
 acquiring the bits of the pulse width modulation module;   acquiring the bits of the pulse amplitude modulation module;   determining a maximum display grayscale of each pixel according to the bits of the pulse width modulation module and the bits of the pulse amplitude modulation module; and   determining the waveform corresponding to the data signal outputted from the pulse width modulation module and the strength corresponding to the data signal outputted from the pulse amplitude modulation module at each display grayscale according to the maximum display grayscale of each pixel.   
     
     
         19 . The driving method of display panel according to  claim 18 , wherein the step of determining the waveform corresponding to the data signal outputted from the pulse width modulation module and the strength corresponding to the data signal outputted from the pulse amplitude modulation module at each display grayscale according to the maximum display grayscale of each pixel comprises:
 determining a type of the waveform corresponding to the data signal according to the bits of the pulse width modulation module;   determining a type of the strength corresponding to the data signal according to the bits of the pulse amplitude modulation module; and   determining the waveform corresponding to the data signal outputted from the pulse width modulation module and the strength corresponding to the data signal outputted from the pulse amplitude modulation module at each display grayscale according to the type of the waveform corresponding to the data signal and the type of the strength corresponding to the data signal.   
     
     
         20 . The driving method of display panel according to  claim 17 , wherein before the step of acquiring the to-be-displayed image of the display panel, the driving method further comprises steps of:
 acquiring a value of a parasitic capacitance of the pixel when the pixel is not displayed;   determining a waveform corresponding to a compensation data signal of the pixel and a strength corresponding to the compensation data signal of the pixel according to the value of the parasitic capacitance; and   actuating the pulse width modulation module and the pulse amplitude modulation module to output the strength corresponding to the compensation data signal respectively.